Air-feed for carbureters



D.- PLAVSA.

AIR FEED FOR CARBURETERS.

APPLICATION FILED OCT. 16, 1919.

1 29,545 Patented Feb. 3, 1920.

2 SHEETSSHEET I.

Svwewfoz D. PLAVSA.

AiH FEED FOR CARBURETERS.

APPLICATION FILED OCT. 16. 1919.

1 29,545 Patented Feb. 3, 1920.

2 SHEETSSHEET 2.

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UNITED STATES PATENT OFFICE.

DUJO PLAVSA, OF GLOBE, ARIZONA ASSIGNGR O1 ONE-HALF TO STEVE ANDROVICH,

OF GLOBE, ARIZONA,

AIR-FEED .EGl't CARB URETERS.

Application filed October 16, 1919.

To all whom it may concern:

Be it known that I, DUJO PLAvsA, a citizen of Jugo-Slavia, havingdeclared my intention to become a citizen of the United States ofAmerica, residing at Globe, in the county of Gila and State of Arizona,have invented certain new and useful Improvements in Air-Feeds forCarbureters, of which the following is a. specification.

The primary object of the present invention resides in the provision ofa controlling device for the admission of air to a carbureter wherebygreater eiiiciency in the operation of an engine provided with thecarbureter will be obtainable.

A further object of the invention consists of a closure cap for the airintake of a carbureter with oppositely opening flap valves carried atopposite sides thereof, one of which is adapted to be opened to permitair to be fed to the carbureter with the opposite valve closed, and withthe valves reversely operating should the engine back fire through thecarbureter.

With the above general objects in view and others that will becomeapparent as the nature of the invention is better understood, the sameconsists in the novel construction, combination, and arrangement ofparts to be hereinafter more fully described and then claimed referencebeing had to the accompanyin drawings by like characters designatingcorresponding parts throughoutthe several views, and in which,

Figure 1 is a side elevational view of a carbureter with the presentinvention in operative position thereon,

Fig. 2 is a top plan view of the same,

Fig. 3 is a view similar to Fig. 1 with a portion of the air controldevice and a portion of the carbureter shown in vertical section, thefiap valves being in closed position,

Fig. a is a fragmentary View, partially in section showing the air inletvalve in open position,

Fig. 5 is a view similar to Fig. 1 with the air inlet valve closed andthe diametrically opposite valve open, and

Fig. 6 is a cross sectional view taken on line VIVI of Fig. 1 showingthe bail for limiting the opening movement of one valve and providing astop for the other valve.

The present invention relates more par- Specification of Letters Patent.

Patented Feb. 3, 1920.

Serial No. 331,139.

ticularly to devices for controlling the sup ply of air to a carbureterand includes a short pipe section closed at one end with the open endthereof received on the air intake pipe of a carbureter and securelyretained against displacement. A pair of openings are provided indiametrically opposite sides of the pipe section and are closed by flapvalves opening in the same direction,.one

being contained within the pipe and the other one exteriorly positionedthereof, the inwardly positioned valve being adapted to be opened uponthe creation of a vacuum in the carbureter for the admissionof air tothe pipe while the exteriorly positioned valve is closed. Should theengine, to which the carbureter is attached,.have a charge of gastherein prematurely exploded, the back fire passing to the carbureterWill close the inwardly positioned valve and escape through theoutwardly positioned valve,the opening movement of which is controlledby a bail embodying a portion overlying the outer valve and having apart thereof extending transversely of the pipe for engagement by theinwardly positioned valve to constitute a limiting stop therefor.

Referring more in detail to the accompanying (:lrawings, there isillustrated a carbureter 7 of ordinary construction having an air inletpipe 8 freely open at its outer,

end as illustrated in Fig. 3, the carbureter having the usual fuelsupply 9 fuel control device 10 and air regulator 11 and a throttle .12,while the lower end of the carbureter is provided with a drain cook 13.

The air supply to the carbureter includes a pipe section 1 1 closed atone end as at 15 with the open end thereof telescopically receiving thecarbureter air inlet 8 and retained in sealing contact therewith by theband 16, the pipe 8 having an unobstructed communication with theinterior of the pipe 14:. At diametrically opposite sides of the pipe 11, preferably at the lower and upper sides thereof are formed openings17 and 18 respectively, the opening 17 being closed by a flap valve 19positioned interiorly of the pipe 14 and pivoted thereto as at 20adjacent one end of the opening 17 so that when the flap valve 19 is inclosed position as indicated in Figs. 3 and 5 the opening 17 will beentirely closed, it being noted that the flap valve 19 is curvedtransversely c0incident t0 the curvature of the pipe 14. In order topermit the escape of gases upon a back firing of the engine, the flapvalve 21 for the opening 18 is positioned exteriorly of the pipe 14 andis pivoted thereto as at 22, the flap valve 21 being transversely curvedrelative to the pipe 14 to engage the same throughout its width as shownin Fig. 6. A bail 23 is curved about the upper side of the pipe 14 andoverlies the flap valve 21 to limit the opening movement thereof asindicated in Fig. 5, the bail 23 including a horizontal portion 24extending transversely of the pipe 14 to be engaged by the valve 19 tolimit the opening movement of the valve, it being obvious that thesingle bail performs the double function of a stop for the two valves.

From this description of the device it is thought that the constructionand operation thereof will at once be apparent, it

being noted that suction created in the engine causesthe feeding of airto the carbureter 7 through the valve controlled opening '17 in the pipe14, the valve being limited in its opening movement by'engaging thehorizontal portion 24 of the bail, and re turnable to its seat by itsown weight upon the absence of the vacuum in the carburetor. Should thegas in the engine be prematurely ignited, the expansion thereof or backfire would pass through the carbureter 7 and into the pipe 14, closingthe valve 19 and escaping through the opening 18, forcing the flap valve21 to its open position as shown in Fig. 5 with the valve limited in rits opening movement by engagement with the bail 23 as illustrated.

While there is herein shown and described the preferred embodiment ofthe invention, it is to be understood that changes may be made as tominor details, of construction which will fall within the scope of theinvention set forth in the subject matter hereinafter claimed.

That is claimed as new is 1. Means for controlling the admission of airto a carbureter comprising a pipe closed at one end with the open endadapted to be secured to the air intake pipe of a car bureter, valvecontrolled openings in said pipe, a bail including aportion overlyingone of said valves to limit the opening movement thereof, and a part ofsaid bail extending transversely of said pipe for limiting the openingmovement of the other valve.

2. Means for cOntrolling the admission of air to a carbureter comprisinga pipe closed at one end with the open end adapted to be secured to theair intake pipe of a carbureter, said pipe having diametrically oppositeopenings therein, a flap valve associated with each opening, said valvesswinging in the same direction with one valve arranged interiorly of thepipe and the other valve exteriorly thereof, and a single bail adaptedto be engaged by said valves for limiting the opening movement thereof.

In testimony whereof I affix my signature;

DUJO PLAVSA.

